Allouez Water Hardness & Quality Report (2026)

The Allouez Village Water Department supplies the Village of Allouez, a suburb of Green Bay, Wisconsin, to roughly 15,000 residents. Their current water comes from Lake Michigan, delivered via a 65-mile pipeline operated by Manitowoc Public Utilities. Allouez no longer uses its old groundwater wells. The water arrives already treated from Manitowoc's lakeshore facility, meaning no separate treatment plant is listed for Allouez itself. This supply is part of the extensive Great Lakes watershed.

Geologically, the Lake Michigan basin sits atop Paleozoic bedrock, predominantly Silurian dolomite and limestone. These rock types naturally release minerals into the water, giving it a moderately mineralized quality. The village's former wells tapped into shallower glacial aquifers and deeper Cambrian-Ordovician sandstones and dolomites in northeast Wisconsin. Extended contact with these underground formations increased the mineral content, resulting in a harder water profile before the switch to Lake Michigan.

With water hardness at 128.4 mg/L, homeowners might observe some scale accumulation in appliances like water heaters and dishwashers, potentially shortening their lifespan and reducing efficiency. You'll also find that soap doesn't lather quite as easily, and glassware might show spots after washing. Appliances such as boilers and washing machines can be affected. Simple maintenance, like descaling with vinegar or cleaning aerators, can help manage scale. For optimal appliance function and protection, installing a water softener is a good idea. The water is considered excellent quality with no reported violations.